[llvm-bugs] [Bug 45809] New: libclang has no registered targets after r371787

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45809

            Bug ID: 45809
           Summary: libclang has no registered targets after r371787
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dmajor at mozilla.com
                CC: jkorous at apple.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk
            Blocks: 45309

After r371787 [0], when Rust's bindgen uses libclang, it fails with "no targets
are registered" [1].

This only happens when we build LLVM with `-DLLVM_LINK_LLVM_DYLIB=ON`.

jkorous: I'm not clear on why `LLVMSupport` was added to libclang's
CMakeLists.txt. If I remove that line, the code still compiles, and this bug
goes away. I'm not familiar with this part of the code though -- do you have
any idea what might be going on?

[0] https://reviews.llvm.org/rL371787
[1]
https://github.com/llvm/llvm-project/blob/2946cd701067404b99c39fb29dc9c74bd7193eb3/llvm/lib/Support/TargetRegistry.cpp#L66


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=45309
[Bug 45309] [meta] 10.0.1 Release Blockers
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